Regression: scm export doesn't work for single files

Since v1.4 it's not possible anymore to export a single file as the connectionUrl. If I use a directory as the connectionUrl or the older v1.3 everything works fine.
The error occurs with the following configuration:

<configuration>
<exportDirectory>E:/Project/target/de</exportDirectory>
<connectionUrl>scm:.../de/UserGuide.pdf</connectionUrl>
</configuration>

Output is:
[INFO] Executing: cmd.exe /X /C "svn --username ... --no-auth-cache --non-interactive export --force svn://.../de/UserGuide.pdf E:\Project\target\de"
[INFO] Working directory: E:\Project\target\docs-de
[ERROR] Provider message:
[ERROR] The svn command failed.
[ERROR] Command output:
[ERROR] svn: Can't move 'E:\Project\target\tempfile.tmp' to 'E:\Project\target\de': Access denied

Regards
Lars